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ORA-12514: TNS:listener does not currently know of service requested in connect

it can be one of these

  • check database status for single instance and CDB and PDB status for multitenant
  • srvctl status database -d dbname or show pdbs from sqlplus
  • check services status with – srvctl status service -d dbname
  • check OUD or TNS entry for correct service name
  • check remote_listener parameter – show parameter remote_listener
  • check PDB name

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